Desert Sandstorm Simulator (2D)

This 2D simulator drives real saltation and suspension physics from a single wind-speed slider: once the surface friction velocity clears Bagnold's threshold, sand grains start skipping across the dune in a saltation layer, their impacts sandblast fine dust loose, and — if the wind keeps that dust aloft faster than its Stokes settling velocity — the dust builds into a suspended cloud that thickens into an advancing wall. A live Koschmieder-law readout converts the resulting airborne concentration directly into a visibility distance, so raising the wind or the surface's erodible dust availability visibly collapses sight distance from a clear desert horizon down to the near-zero visibility of a real haboob.